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Inventories, Net - Inventories, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Total raw materials $ 2,770 $ 2,730
Total work-in-process 10,667 9,836
Total finished goods 2,891 2,816
Total inventories, net 16,328 15,382
Security Products    
Inventory [Line Items]    
Total raw materials 2,174 2,156
Total work-in-process 8,954 8,290
Total finished goods 2,148 2,079
Marine Components    
Inventory [Line Items]    
Total raw materials 596 574
Total work-in-process 1,713 1,546
Total finished goods $ 743 $ 737